Ecopath some papers there are mentioned they include more than one species in a functional group like this.
1. Prawns
Penaeus monodon
P. indicus
P. semisulcatus,
Metapenaeus dobsoni
M. Monocerous Macrobrachiumsp.
2. Perches
Lates calcarifer
Rhabdosarguss arba
Crenidens crenidens
Datnioides polota
How can we take these species' Q/B, P/B, diet matrix, and biomass?
is it like we need to sum the Q/B of all the groups and divide by the number of groups?
Thanks
Ecopath is a modeling software used for constructing and analyzing ecosystem models. The model inputs required for Ecopath include information on the species present in the ecosystem, their biomass, diet, and other ecological parameters.
When several species are included in a functional group, the information required for Ecopath is generally provided for the functional group as a whole, rather than for individual species. The ecological parameters for the functional group are then calculated as weighted averages of the parameters of the species that make up the group.
For example, if we have a functional group of prawns that includes Penaeus monodon, P. indicus, P. semisulcatus, Metapenaeus dobsoni, M. Monocerous, and Macrobrachium sp., we would calculate the Q/B, P/B, diet matrix, and biomass for the functional group as a whole. We would not calculate these parameters for each species separately.
To calculate the Q/B, P/B, and biomass for the functional group, we would add up the values for each species in the group, weighted by their relative biomass. For example, if P. monodon makes up 50% of the biomass of the prawn group and has a Q/B of 1.2, and the other species in the group have Q/B values of 1.0, 0.8, 0.9, 1.1, and 1.3, we would calculate the Q/B for the prawn group as:
(0.5 x 1.2) + (0.1 x 1.0) + (0.1 x 0.8) + (0.1 x 0.9) + (0.1 x 1.1) + (0.1 x 1.3) = 1.05
We would follow a similar process to calculate the P/B and biomass for the group.
The diet matrix for the functional group would be constructed based on the diet of the individual species in the group. We would estimate the proportion of each prey item in the diet of each species and use these values to construct a weighted average diet matrix for the group.
In summary, to model functional groups in Ecopath that include multiple species, we need to calculate the relevant ecological parameters for the group as a whole, based on the weighted averages of the parameters of the individual species in the group.
Ahmed Bilal Thanks brother , but jab mayne Chat GPT kou yae question pocha to usney muje aise detail mayn answer nai deay :D
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